Coil and stand



June 18, 1929. F. J. REICHMANN 1317521 conJ AND ySTAND Filed Au'g. 19,' 1926 jg@ 1,55 a? Patented June 18, 1929.

UNITED STATES FRANK J. REICHMANN, 0F CHICAGO, ILLINOIS.

COIL AND STAND.

Application led August 19, 1926.

This invention has to do with induction coils and particularly with the structural arrangements of suoli coils and the support or mounting therefor.

YWhen designing induction coils, it must be borne in mind that the mounting means .employed is very important. The mounting may .have a very great effect upon the coil losses and the life of a coil is determined almost entirely by the manner in which the windings thereofI are supported.

If the same electrical results are to be obtained while the coil is in use7 it is necessary that the windings thereof be maintained as nearly as possible in their original arrangement, for any mutilation thereof may have an effect upon the subsequent behavior of the coil. For this reason, the structural features should permit accuracy of manufacture and assembly.

The objects of the present invention include the provision of an improved induction coil of the toroidal type, having unique structural characteristics and which is economical to manufacture and which is not easily damaged, and a novel mounting therefor. LOW loss in the coil is among the desirable characteristics attained.

In carrying out the invention, the toroidal windings are supported around a dielectric core, which has its periphery shaped to engage the windings in intimate relation, the toroidal coil being preferably secured to this member by tying. A bifurcated mounting member is secured in a slot in the dielectric core and supports portions of insulating material on which the terminals of the coil are supported.

The invention will be more fully understood by a reading of following detailed de scription, considered with the accompanying drawing, in which Figure 1 is an elevation of a coil embodying the main features of the invention, portions thereof being broken away to illustrate some of the internal structure.

Figure 2 is a sectional View, taken on the line 2 2 of Figure 1 looking in the direction of the arrows.

Figure 3 is a view of the coil-supporting portions, looking from the angle at which the mounting member is secured to the coil supporting member.

Figure 4 is a plan View of one form of strip for securing the primary within the secondary.

Serial No. 130,141.

Reference should now be had to the accompanying drawing in which like reference characters are employed to designate similar members throughout the several views as well as in the description which follows.

The main coil supporting member is a core 10, of a. dielectric, preferably of wood. To this is secured a bifurcated mounting member 11, generally secured in a slot in the member 10. A screw 12, or other fastening means may be employed for holding the core 10 and mounting member 11 together. The screw extends through an aperture provided for its passage in a transverse portion 111L of the bifurcated member 11. This transverse portion is disposed between bifurcations which are designated by the reference characters 11b and 11C. A portion of each of the bifurcations 11b and 11c is turned at its end, as illustrated particularly in Figures 2 and 3 to provide a base section for the mounting member. Apertures 13 are provided in said base portions and these may be utilized for the insertion of screws or the like to support the coil upon any suitable base (not shown).

The windings of the coil as illustrated in Figure 1 are disposed around the exterior of the member 10. The windings comprise a primary 15 and a secondary 16. The secondary 16 is secured around the periphery of the member 10 by means of suitable strands 17'. which are preferably tied in the open space 17 (Figure 1) between the ends of the windings of said secondary 16.

A cord of dielectric material 18 such as cotton tape or the like, may be inserted within the convolutions of the secondary 16 before said secondary is placed about the member 10, and be used to secure said secondary upon the periphery of member 10. The material 18, as will appear obvious from a considerzb tion of Figure 2, will be generally concealed by the secondary winding but it is desirable to have it of the same color as the insulation upon the secondary 16.

The block or core 10 is provided with a V- shaped groove about its periphery. The eonvolutions of the secondary 16 are arranged as an uneven sided figure. Seven sides are shown in the drawing. The windings of said secondary 16 arel of. the hill and dale type and succeeding convolutions are not in alignment except at the points7 or angles of the convolutions.

dien the secondary 16 which is produced as a cylinder lateibent to form a torus, one

mounting member 11 is secured in a slot in the central coil supporting core 10. The reason for this type of mounting is to keep the supporting member out of the field of the coil since any conducting object which is projected into the field of the coil increases the power losses therein. Any other specific arrangement embodying this same principle can of course be used, but the best results are probably obtained with the specific construction shown.

A consideration of the design of the coil shows that there is relatively little extraneous protection for the coil. This is of very great advantage in cutting down the coil losses. One of the principal reasons why it is possible to get along with as little protection as is disclosed that the hill and dale winding in itself provides considerable strength to a coil, and it is necessary to use only a narrow band thereof in the manner shown to obtain a rigid structure.

My invention, here disclosed, utilizes certain novel features which have heretofore been unknown in the art. In illustrating these novel features, it has been necessary to show a very specific article in order to make the improvements entirely clear. I do not wish, however, to be bound by the details of this present disclosure, and the invention is to be limited only by the scope of the appended claims.

Included in the advantages of this structure are an increased length of the primary, a smaller core, or coil hole, alarger secondary for the same diameter of transformer coil, a flat outer band for the coil.

That I claim as new and desire to secure by Letters Patent of the United States is 1. An induction coil comprising a toroidal secondary winding, a toroidal primary winding disposed therein, a coil supporting member, a bifurcated mounting member secured to the coil supporting member, a terminal supporting member of non-conducting material secured to each bifurcation, and a pair of terminals on each terminal support ing member, the leads from said primary and said secondary windings being secured to one portion of said terminals, and said termi.- nals including means for securing outgoing leads thereto.

9.. An induction coil as defined in claim 1, and wherein said toroidal secondary winding is of the hill and dale type.

3. An induction coil as defined in claim 1, and wherein said bifurcated mounting member is secured to said core supporting member outside of the field of said coils.

4. An induction coil comprising a toroidal winding, a central supporting member having its periphery formed to engage the toroid in intimate relation, a bifurcated mounting member secured to said supporting member, a terminal supporting member of non-conducting material secured to one of the bifurcations of said supporting' member, and terminals secured to said terminal supporting member.

FRANK J. REICHMANN. 

